mirror of https://github.com/python/cpython
62 lines
2.0 KiB
Python
62 lines
2.0 KiB
Python
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from test.support.bytecode_helper import CodegenTestCase
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# Tests for the code-generation stage of the compiler.
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# Examine the un-optimized code generated from the AST.
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class IsolatedCodeGenTests(CodegenTestCase):
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def codegen_test(self, snippet, expected_insts):
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import ast
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a = ast.parse(snippet, "my_file.py", "exec")
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insts = self.generate_code(a)
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self.assertInstructionsMatch(insts, expected_insts)
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def test_if_expression(self):
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snippet = "42 if True else 24"
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false_lbl = self.Label()
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expected = [
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('RESUME', 0, 0),
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('LOAD_CONST', 0, 1),
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('TO_BOOL', 0, 1),
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('POP_JUMP_IF_FALSE', false_lbl := self.Label(), 1),
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('LOAD_CONST', 1, 1),
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('JUMP_NO_INTERRUPT', exit_lbl := self.Label()),
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false_lbl,
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('LOAD_CONST', 2, 1),
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exit_lbl,
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('POP_TOP', None),
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('LOAD_CONST', 3),
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('RETURN_VALUE', None),
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]
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self.codegen_test(snippet, expected)
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def test_for_loop(self):
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snippet = "for x in l:\n\tprint(x)"
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false_lbl = self.Label()
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expected = [
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('RESUME', 0, 0),
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('LOAD_NAME', 0, 1),
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('GET_ITER', None, 1),
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loop_lbl := self.Label(),
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('FOR_ITER', exit_lbl := self.Label(), 1),
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('STORE_NAME', 1, 1),
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('LOAD_NAME', 2, 2),
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('PUSH_NULL', None, 2),
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('LOAD_NAME', 1, 2),
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('CALL', 1, 2),
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('POP_TOP', None),
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('JUMP', loop_lbl),
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exit_lbl,
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('END_FOR', None),
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('POP_TOP', None),
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('LOAD_CONST', 0),
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('RETURN_VALUE', None),
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]
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self.codegen_test(snippet, expected)
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def test_syntax_error__return_not_in_function(self):
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snippet = "return 42"
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with self.assertRaisesRegex(SyntaxError, "'return' outside function"):
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self.codegen_test(snippet, None)
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